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Reflx Arc

Reflexes occur over neural pathways called reflx arc; Flexor, planar, stretch (knee jerk), abdominal

How many pairs of periphereal nerves come out from spinal chord?

31 pairs; made up of efferent, afferent, motor, and mixed erves from receptor sites to effector sites

Antagonist substances can bind with neurotransmiter recetpr site to inhibit what?

neurotransmitter actions


The change in stimulus information at receptor as becomes a nerve impulse


Largest and thickest plexus area

Phrenic Nerve

one of a pair of nerves that arises from cervical spinal roots and passes down the thorax to innervate the diaphragm and control breathing; Use to Major visceral organs of general body trunk


transduce signal of position of body parts


sensory cells that detect internal stimuli


The light-sensitive cells in the retina- the rods and cones.


sensory cells that detect external stimuli


A sensory receptor that responds to mechanical disturbances, such as shape changes (being squashed, bent, pulled, etc.). Mechanoreceptors include touch receptors in the skin, hair cells, in the ear, muscle spindles, and others.


Sensory receptors which respond to pain or excess stimulation.

Meissners corpuscles

where tactile sensitives are well developed, live in hairless regions, sensitive to (light,touch), upper part of dermis

Pancinian corpuscles

pressure nerves found in the dermis reticular region

Bell's palsy

an injury or infection to the facial nerves, which then becomes inflamed, shows as paralysis of facial muscles, loss of taste, difficulty chewing and the affected eye may remain open all the time (effects may be permanent)


condition that causes tumors to grow on nerve tissue, producing skin and bone abnormalities


an acute viral disease marked by inflammation of nerve cells of the brain stem and spinal cord

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